Expansion-bolt anchor.



H. W. PLEISTER. EXPANSION BOLT ANGHUR.

i. APPLICATION FILED JAN.16, 19.08.

lPatented Aug. 3, 1909.

marre sraras earner namen.

HENRY W. PLEISTER, OF WESTFIELD, NEW JERSEY, ASSIGNOR 'l`O HENRY ll. NEWHALL, OF

PLAINFIELD, NEW JERSEY. f

EXPANSION-BOLT ANCHOR.

Specification of Letters atent.

Patented Aug. 3, 1909.-

To all whom it v'may concern. v

Be it known that l, Hmsnww. Primeras,

a citizen of the United States, and a resident of Westfield, in the county of Union and State of N ew Jersey, have invented certain new andnseful lmprovements in Expansion Bolt Anchors, (Case 1),) of which the following -is a speciiication', taken in connection with the accompanying drawings, which form a part of the same.

This invention relates to expansion bolt anchors wherein the gripping action is performed by radially movable gripping menibers and by the shields 'which are also mov able with relation to each other.

In the accompanying drawings showing an illustrative embodiment or" this invention and in which the same reference numerals refer to similar parts in the several figures, Figure l is a plan view of one of the shields of my bolt anchor showing machine screw threads in the shield and on the bolt, the expanders being shown in position, and a portion of the figure being illustrated in longitudinal section. Fig. 2 is a transverse vertical section on the line ot' Fig. 1 looking in the direction of the arrows. Fig. 3 is a side elevation of the bolt anchor showing the screw threads in dotted line. Fig. 4 is a perspective View ot' one of the shields. Fig. 5 is a plan view of one of the shields provided with screw threads for a lag screw. Fig. G is a side elevation of one of the ex. panders. Fig. 7 is a plan View of one of the shields showing a slight modification. Fig.

8 is a side elevation of a modified form ofA bolt anchor. Fig. 9 is a side elevation of one oi' the expanders showing a dierent manner of pivoting it.

In the illustrative embodiment of the invention shown in the drawings, l is a supported member which it is desired to secure to the support 2 of n'iasonry, brick, cement or any other material, by my improved expansion bolt 3 and machine bolt Li, though it is to be understood ofcourse, that a lag screw, or any other suitable expanding means may be employed.

My improved bolt anchor may be formed of a plurality of shields, two such shields 5 and 6 being shown in the drawings, though my inventioais not limited to this number. n the form illustrated the two shields when placed together make a. substantially cylinydrical hollow body, the interior of eachv l l i E shield being provided with a tapering bore 7 which is preferably, though not necessarily, screw-threaded either with threads 8 to tit the machine screw threads upon the bolt 4;, Fig. l, orv with screw threads l), Fig. 5, to cofperate. with the 'threads of a lag screw.

rihe meeting surfaces of one or both of the shields 5 and 6 are eut away, as shown at l0 and lvl, Fig. 3, forming a slot l2 when the shields are placed together, Fig. 3. @n 65 the meeting surfaces 13 of the shield 5 and upon the meeting surfaces 1l of the shield 6 I preferably, though not necessarily, place sockets or recesses and enlargements or ribs to cooperate with each other. It is immaterial on which member these are placed or the number used. In the drawings I have shown the projections or ribs l5, l5, upon the shield 5 and the sockets or recesses 16, 16, upon the shield 6, this arrangement, however, may be reversed and the number v of these parts varied without departing from my invention.

lVithin the slots l2 l mount my expanders 1T, 1T, so that they may have an outward 80 radialw movement heilig actuated in this direction upon the insertion of either the lag screw, machine bolt or any other suitable means. These expanders may be formed of any suitable material. Preferably l. slamp them out of any suitable metal forming at the same time upon them teeth It), li), and mutilated screw threads 1S, 1S, 'to correspond with the screw threads upon the machine holt or lag screw or any nher suitable means. it is to be understood, however, that both the teeth and nnitilated .screw threads upon Athe expanders may be omitted. 'lVli-en the,

expanders are made of setter material than the threads upon the machin'.` boli, lag .screw 95 or other'` expanding means, coinplclncntary threads will be cut in the cxpal'nlers h v the threads upon the bolt or screw. These eX- panders l? are preferaldy though not necessarily formed with a taper, their end 2O be- 100 ing narrower than the end 2l, the dilerence,

or taper, being varied when desired to regulate the radial movement or throw of the expanders.

i 'ln the collapsed or inoperative position of 105 the expanders their outer surface, or teeth 19',`19,` when such are used, lie within the circumference of the bolt anchor 8 being Q2, Figs. 1 and 2.

` bolt.

suitable manuel'.

IVhile I preferably loosely mount the eX- panders 17, 17 within the slots l2, l2, I may, however, pivot them within the slots in any In lfig. 7 I have shown a lug formed on the expander 24k and a ,recess 25 in' the surface Q6 of the shield though this arrangement may be reversed. They may be pivoted, however, in any suit- -able manner, as by casting or otherwise securing lugs or pins Q7, 2t, on the surfaces 10 and ll, permitting one or both of the lugs cooperating with a hole 28 in one. end of. the expander, see F Moreover to conne the expanders and prevent their movement along the axis of the substantially cylindrical bolt anchor 3, I preferably, though not necessarily form or otherwise secure lips.l 3l, Sl'upon one or both of the shields G and 7, Fig. S. only one lip is used it should be ol substantially the same thickness as the expander which /it is to confine. -In some cases it may not be desirable to form threads upon either the expanders or upon the' shields, as shown for instance in F ig. 7.

In handling and shipping the bolt anchors the shields and expanders are preferablysecured together in any suitable manner, as

lby the split spring ring 22, the ribs 15 and socket 1 cooperating to Vprevent relative movement ot' the shields. Theseribs and sockets furthermore prevent relative movement .of the shields upon the insertionan'd manipulation of the lag screw or machine The bore 7 of the different shields is pref-l erably though not necessarily tapered to co-v operate with the machine bolt or lag screw to permitthe screw or bolt not only forcing outward or radially the expanders 17, 17, but also the shields 5 and G. .Theseshields are forced away from each other and supplement the powerfulA gripping action of the expanders 17, 17 upon the walls of the hole 29 in the masonry or other suitable support 2. rI`he friction of theshields 5 and 6 -may be increased, if desired, by forming-teeth or seri-ations 30, 30 upon their exterior surfaces.

I-Iaving thus described this invention in connection vwith an illustrative embodiment thereof, to the details of which I do` not desire vto be limited, what is claimed as `new expanders mounted in the cut and what it is desired .to secure by Letters Patent is set forth in the appended claims.

l. In a bolt anchor, the combination of a,`

plurality of radiall movable shields, and one or more radially movable expanders supported by the shields. y

2. In a bolt anchor, the combination of a plurality of radially movable shields, and one or more pivoted expanders supported by the shields. l

3. In a bolt anchor, the combination of a plurality of movable shields, one or more of the shields having a' cutaway portion and one or more recesses, one or more ribs upon the complementary shields, and one .or more expanders mounted in the cut away part of the shield or shields. 4. In a bolt anchor, a pluralit of separate shields each having a bore, an pivote'd expanders carried or supported by the shields. 5. In a bolt anchor, a plurality of separate shields each having a tapering bore and a out away portion, and one or more pivoted of the shields 6. In a bolt anchor, two separate shields, a bore-in each shield, a lip upon each of the shields to assist in confining the expanders,

away portion each shield having a reduced or cut away por.tion,and expanders mounted in the cut away portion. l 7. In a bolt anchor, two separate shields,

a bore in each shield, each shield having a v reduced or cut away portion, pivoted eX-v panders mounted in the cut 'away portions, one or more recesses or sockets in one of the shields and oneor more ribs in the other shield.

l8. In a bolt anchor, two separate shields,-

a bore'in each shield, each shield having a reduced or cut away portion, pivoted taper-` ing expanders mounted in the vcut away p01'- tion, and ribs and recesses' or sockets upon the shields. v v.

-9. In a. bolt anchor, two separate shields, a bore `in each shield, each shield having a reduced'or cut' 'away portion, expanders mounted in the cutaway portion, and a lip upon one of the shieldsvv to assist. in conning l the eapanders.

A`Witnessesi l MaRGERr--AJAMSQN,

. .ALAN M. JOHNSON. ,l 

